Add standalone TypeScript MicroApp client

[xaviablaza]

Summary

• add a standalone Node.js 20+ TypeScript SDK and nvg micro-apps CLI under typescript/
• implement MicroApp create/list/show plus direct archive upload, publication creation/finalization/polling, and write-only environment setup
• package directories as deterministic tar.gz archives and compute Active Storage Base64 MD5 plus publication SHA-256 checksums
• preserve the existing Rust CLI profile format and keep API bearer credentials isolated from storage uploads
• publish typed ESM output as @hostari/nvg with CLI and library documentation

Commands

• nvg micro-apps list|show|create|publish
• nvg micro-apps publications list|show|finalize
• nvg micro-apps environment set (JSON secrets from stdin only)

Verification

• npm run check — typecheck, 7 tests, production ESM/DTS build
• packed tarball installed into a clean temporary npm project
• packed nvg --version returned 0.1.0
• packed SDK import and API request smoke test passed
• npm audit --omit=dev — 0 vulnerabilities
• existing Rust cargo test — passed
• independent pre-commit review — no remaining merge blockers
• git diff --check — passed

Dependency

The MicroApp endpoints are introduced by hostari/navegante_web#1472. This client follows that PR’s docs/micro-app-cli-api.md contract, including canonical app_port manifest fields and machine-readable error codes.

Notes

The existing Rust implementation remains unchanged. cargo fmt --check currently reports formatting differences in pre-existing Rust files; this PR does not touch those files.